At this point I can see no difference, or ill effects, from using the Wal-Mart nutrients, epsom salt and calcium nitrate for my test grown lettuce. For the past two weeks the plants have been growing in an ebb and flow system under a 90 watt red/blue/white UFO LED with a fifteen minute feeding cycle every four hours, and they are perfectly normal in every respect.
As I will begin harvesting individual leaves this week I have already started seeds for a replacement batch of lettuce using the same nutrient mix. The varieties I have selected for this batch are: Green Butterhead, Grand Rapids and Black Seeded Simpson.
As my confidence level in this trial is fairly high I purchased several more boxes of nutrients from the local Wal-Mart garden center before it disappears until next spring.
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